Coarsening resistance of M2C carbides in secondary hardening steels: Part II. Alloy design aided by a thermochemical database |
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| Authors: | Hyuck Mo Lee Samuel M. Allen Mica Grujicic |
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| Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 305-701 Taejon, Korea;(2) Center for Materials Science and Engineering, Massachusetts Institute of Technology, 02139 Cambridge, MA;(3) Department of Mechanical Engineering, Clemson University, 29631 Clemson, SC |
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| Abstract: | In high Co-Ni steels containing the strong carbide-forming elements Mo, Cr, and W, secondary hardening is accomplished by the precipitation of fine-scale M2C alloy carbides. Thermodynamic stability and coarsening resistance of these carbides depend on the alloy content of these elements. A model for the M2C coarsening kinetics in multicomponent alloys has been used to identify the optimum alloying addition for maximum coarsening resistance and as a basis for selection of four experimental alloy steels. Necessary information pertaining to the equilibrium in these steels was obtained using the Thermo-Calc software and database developed at the Royal Institute of Technology, Stockholm, Sweden. |
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